LOW SWELL, LONG-LIVED HYDROGEL SEALANT
First Claim
1. A kit comprising:
- a) a first aqueous solution or dispersion comprising at least one highly oxidized polysaccharide containing aldehyde groups, said highly oxidized polysaccharide having a weight-average molecular weight of about 1,000 to about 1,000,000 Daltons and an equivalent weight per aldehyde group of about 65 to about 85 Daltons, wherein said first aqueous solution or dispersion contains said highly oxidized polysaccharide at a concentration of 6% to about 40% by weight; and
b) a second aqueous solution or dispersion comprising at least one water-dispersible, multi-arm amine wherein at least three of the arms are terminated by at least one primary amine group, said multi-arm amine having a number-average molecular weight of about 450 to about 200,000 Daltons, wherein said second aqueous solution or dispersion contains said multi-arm amine at a concentration of about 5% to about 70% by weight;
provided that;
(i) if the concentration of the highly oxidized polysaccharide in the first aqueous solution or dispersion is equal to or greater than 6 wt % but less than 8 wt %, the equivalent weight per aldehyde group of the highly oxidized polysaccharide is about 65 to about 70 Daltons;
(ii) if the concentration of the highly oxidized polysaccharide in the first aqueous solution or dispersion is equal to or greater than 8 wt % to about 40 wt %, the equivalent weight per aldehyde group of the highly oxidized polysaccharide is about 65 to about 85 Daltons.
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Accused Products
Abstract
A low swell, long-lived hydrogel sealant formed by reacting a highly oxidized polysaccharide containing aldehyde groups with a multi-arm amine is described. The hydrogel sealant may be particularly suitable for applications requiring low swell and slow degradation, for example, ophthalmic applications such as sealing wounds resulting from trauma such as corneal lacerations, or from surgical procedures such as vitrectomy procedures, cataract surgery, LASIK surgery, glaucoma surgery, and corneal transplants; neurosurgery applications, such as sealing the dura; and as a plug to seal a fistula or the punctum. The low swell, long-lived hydrogel sealant may also be useful as a tissue sealant and adhesive, and as an anti-adhesion barrier.
114 Citations
18 Claims
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1. A kit comprising:
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a) a first aqueous solution or dispersion comprising at least one highly oxidized polysaccharide containing aldehyde groups, said highly oxidized polysaccharide having a weight-average molecular weight of about 1,000 to about 1,000,000 Daltons and an equivalent weight per aldehyde group of about 65 to about 85 Daltons, wherein said first aqueous solution or dispersion contains said highly oxidized polysaccharide at a concentration of 6% to about 40% by weight; and b) a second aqueous solution or dispersion comprising at least one water-dispersible, multi-arm amine wherein at least three of the arms are terminated by at least one primary amine group, said multi-arm amine having a number-average molecular weight of about 450 to about 200,000 Daltons, wherein said second aqueous solution or dispersion contains said multi-arm amine at a concentration of about 5% to about 70% by weight; provided that; (i) if the concentration of the highly oxidized polysaccharide in the first aqueous solution or dispersion is equal to or greater than 6 wt % but less than 8 wt %, the equivalent weight per aldehyde group of the highly oxidized polysaccharide is about 65 to about 70 Daltons; (ii) if the concentration of the highly oxidized polysaccharide in the first aqueous solution or dispersion is equal to or greater than 8 wt % to about 40 wt %, the equivalent weight per aldehyde group of the highly oxidized polysaccharide is about 65 to about 85 Daltons. - View Dependent Claims (2, 3, 4, 5)
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6. A dried hydrogel formed by a process comprising the steps of:
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a) combining (i) a first solution or dispersion comprising at least one highly oxidized polysaccharide containing aldehyde groups in a first solvent, said oxidized polysaccharide having a weight-average molecular weight of about 1,000 to about 1,000,000 Daltons and an equivalent weight per aldehyde group of about 65 to about 85 Daltons, wherein said first solution or dispersion contains said highly oxidized polysaccharide at a concentration of 6% to about 40% by weight;
with (ii) a second solution or dispersion comprising at least one water-dispersible, multi-arm amine in a second solvent, wherein at least three of the arms of said multi-arm amine are terminated by at least one primary amine group, said multi-arm amine having a number-average molecular weight of about 450 to about 200,000 Daltons, wherein said second solution or dispersion contains said multi-arm amine at a concentration of about 5% to about 70% by weight, to form a hydrogel, wherein the first solvent is either the same as or different from the second solvent; andb) treating the hydrogel to remove at least a portion of said first solvent and said second solvent to form the dried hydrogel; provided that; (i) if the concentration of the highly oxidized polysaccharide in the first solution or dispersion is equal to or greater than 6 wt % but less than 8 wt %, the equivalent weight per aldehyde group of the highly oxidized polysaccharide is about 65 to about 70 Daltons; (ii) if the concentration of the highly oxidized polysaccharide in the first solution or dispersion is equal to or greater than 8 wt % to about 40 wt %, the equivalent weight per aldehyde group of the highly oxidized polysaccharide is about 65 to about 85 Daltons. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for applying a coating to an anatomical site on tissue of a living organism comprising:
- applying to the site (a) a first aqueous solution or dispersion comprising at least one highly oxidized polysaccharide containing aldehyde groups, said highly oxidized polysaccharide having a weight-average molecular weight of about 1,000 to about 1,000,000 Daltons and an equivalent weight per aldehyde group of about 65 to about 85 Daltons, wherein said first aqueous solution or dispersion contains said highly oxidized polysaccharide at a concentration of 6% to about 40% by weight;
followed by (b) a second aqueous solution or dispersion comprising at least one water-dispersible, multi-arm amine wherein at least three of the arms are terminated by at least one primary amine group, said multi-arm amine having a number-average molecular weight of about 450 to about 200,000 Daltons, wherein said second aqueous solution or dispersion contains said multi-arm amine at a concentration of about 5% to about 70% by weight, orapplying (b) followed by (a) and mixing (a) and (b) on the site, or premixing (a) and (b) to form a mixture and applying said mixture to the site; provided that; (i) if the concentration of the highly oxidized polysaccharide in the first aqueous solution or dispersion is equal to or greater than 6 wt % but less than 8 wt %, the equivalent weight per aldehyde group of the highly oxidized polysaccharide is about 65 to about 70 Daltons; (ii) if the concentration of the highly oxidized polysaccharide in the first aqueous solution or dispersion is equal to or greater than 8 wt % to about 40 wt %, the equivalent weight per aldehyde group of the highly oxidized polysaccharide is about 65 to about 85 Daltons. - View Dependent Claims (14)
- applying to the site (a) a first aqueous solution or dispersion comprising at least one highly oxidized polysaccharide containing aldehyde groups, said highly oxidized polysaccharide having a weight-average molecular weight of about 1,000 to about 1,000,000 Daltons and an equivalent weight per aldehyde group of about 65 to about 85 Daltons, wherein said first aqueous solution or dispersion contains said highly oxidized polysaccharide at a concentration of 6% to about 40% by weight;
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15. A composition comprising the reaction product of:
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a) a first aqueous solution or dispersion comprising at least one highly oxidized polysaccharide containing aldehyde groups, said highly oxidized polysaccharide having a weight-average molecular weight of about 1,000 to about 1,000,000 Daltons and an equivalent weight per aldehyde group of about 65 to about 85 Daltons, wherein said first aqueous solution or dispersion contains said highly oxidized polysaccharide at a concentration of 6% to about 40% by weight; and b) a second aqueous solution or dispersion comprising at least one water-dispersible, multi-arm amine wherein at least three of the arms are terminated by at least one primary amine group, said multi-arm amine having a number-average molecular weight of about 450 to about 200,000 Daltons, wherein said second aqueous solution or dispersion contains said multi-arm amine at a concentration of about 5% to about 70% by weight; provided that; (i) if the concentration of the highly oxidized polysaccharide in the first aqueous solution or dispersion is equal to or greater than 6 wt % but less than 8 wt %, the equivalent weight per aldehyde group of the highly oxidized polysaccharide is about 65 to about 70 Daltons; (ii) if the concentration of the highly oxidized polysaccharide in the first aqueous solution or dispersion is equal to or greater than 8 wt % to about 40 wt %, the equivalent weight per aldehyde group of the highly oxidized polysaccharide is about 65 to about 85 Daltons. - View Dependent Claims (16, 17, 18)
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Specification